Air filter



FIG. 1 is a front perspective view of an air filter housing showing my new design;

FIG. 2 is a left side plan view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is a right side plan view thereof;

FIG. 5 is a rear plan view thereof;

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view thereof; and

FIG. 8 is a front perspective view of an air filter housing showing another embodiment of my new design;

FIG. 9 is a left side plan view thereof;

FIG. 10 is a front plan view thereof;

FIG. 11 is a right side plan view thereof;

FIG. 12 is a rear plan view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom plan view thereof.

The broken lines shown within the figures form no part of the claimed design. The bottom surfaces shown in FIGS. 7 and 14 form no part of the claimed design. 

CLAIM The ornamental design for an air filter, as shown and described. 